问题:
A . to verify the type of cable interconnecting two devices
B . to determine the status of network services on a remote device
C . to obtain VLAN information from directly connected switches
D . to verify Layer 2 connectivity between two devices when Layer 3 fails
E . to obtain the IP address of a connected device in order to telnet to the device
F . to determine the status of the routing protocols between directly connected router
● 参考解析
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